why not just run up and break the guys' neck? cause the range is going to be 10 ft or less, and you can charge/dive on the guy from 10 ft in 1.0 second or less. Sounds silly? well, it's even MORE silly to assume that you're going to be ALLOWED to go get the gun. Better figure on being shot/stabbed/clubbed 4x per second, for that 3-5 seconds. CCW your gun, everywhere. Then you can be firing it 1.5 second after you see the need for it, and you can be POINTING it at the miscreant (normally all that's required) in 3/4 second.